Lexus SC300 / Lexus SC400. Manual - part 441

9. 

REMOVE TIMING BELT REAR PLATES
Remove the two bolts and rear plate. Remove the two rear
plates.

10. REMOVE VACUUM PIPE

(a)  Disconnect the following hoses:

(1)

(USA Spec.)
Vacuum hose from throttle body

(2)

(Exc. USA Spec.)
Three vacuum hoses from throttle body

(3)

Vacuum hose from fuel pressure regulator

(4)

Two vacuum hoses from VSV for fuel pressure con-
trol system

(5)

(Exc. USA Spec.)
Two vacuum hoses from EGR vacuum modulator

(6)

Two vacuum hoses (from VSV for EVAP system)
from vacuum pipe

(7)

Vacuum hose (from VSV for fuel pressure control
system) from air intake chamber

(8)

Vacuum hose (from charcoal canister) from vacu-
um pipe.

(b)  Remove the two bolts, the vacuum pipe and vacuum

hoses assembly.

EM–62

–

ENGINE MECHANICAL

Cylinder Heads

11. (USA 

Spec.)

REMOVE EGR VALVE
(a)  Disconnect the EGR valve connector.
(b)  Disconnect the following hoses:

(1)

Water by–pass pipe hose from ISC valve

(2)

Water by–pass hose from water by–pass pipe
(from rear water by–pass joint)

(c)  Remove the two nuts, EGR valve and gasket.

12.  (Exc. USA Spec.)

REMOVE EGR VALVE AND VACUUM MODULATOR
(a)  Disconnect the hose clamp (A) from the PCV hose.
(b)  Disconnect the following hoses:

(1)

Water by–pass pipe hose from ISC valve

(2)

Water by–pass hose from water by–pass pipe
(from rear water by–pass joint)

(3)

Two vacuum hoses from VSV for EGR system

(c)  Remove the bolt, two nuts, the EGR valve, vacuum

modulator assembly and gasket.

13.  REMOVE EGR VALVE ADAPTOR

(a)  Disconnect the PCV hose from the cylinder head.

–

ENGINE MECHANICAL

Cylinder Heads

EM–63

(b)  Remove the two bolts, two nuts, adaptor and gasket.
(c)  (USA Spec. only)

Disconnect the EGR gas temperature sensor connec-
tor.

14.  REMOVE ISC VALVE

(a)  Disconnect the ISC valve connector.
(b)  Disconnect the water by–pass hose from the ISC valve.

(c)  Remove the two nuts, ISC valve and gasket.

15.  DISCONNECT HEATER WATER VALVE FROM BODY

(a)  Disconnect the VSV connector.
(b)  Remove the bolt holding the engine wire clamp to the

water valve bracket.

(c)  Remove the two bolts, and disconnect the water valve

and bracket assembly.

16.  REMOVE THROTTLE BODY

(a)  Disconnect the following connectors:

(1)

Throttle position sensor connector

(2)

(w/ TRAC)
Sub–throttle position sensor connector

(3)

(w/ TRAC)
Sub–throttle actuator connector

EM–64

–

ENGINE MECHANICAL

Cylinder Heads

(b)  Remove the two mounting bolts and two mounting nuts,

and disconnect the throttle body from the air intake
chamber.

(c)  Disconnect the following hoses, and remove the throttle

body:

(1)

PCV hose from throttle body

(2)

Water by–pass hose from throttle body

(d)  Remove the throttle body gasket.

17. DISCONNECT 

VACUUM 

HOSES

Disconnect the following hoses:

(1)

Vacuum hose from brake booster union

(2)

Vacuum hose (from VSV for heater water valve)
from air intake chamber

18. REMOVE 

ACCELERATOR 

BRACKET

Remove the bolt, stud bolt and bracket.

19.  REMOVE BRAKE BOOSTER UNION

Remove the union bolt, union and two gaskets.

20.  REMOVE AIR INTAKE CHAMBER

(a)  Disconnect the following connectors:

•

Cold start injector connector

•

VSV connector for fuel pressure control system

•

(Exc. USA Spec.)

VSV connector for EGR system

(b) Remove 

the union bolt and two gaskets, and disconnect

the cold start injector tube from the RH delivery pipe.

–

ENGINE MECHANICAL

Cylinder Heads

EM–65